﻿<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JavaScript 测试</title>
</head>
<body>

</body>
<script>
    var i =5;
    var j = (++i) + (++i) + (++i);
    alert("The first j is ：" + j);
    i = 5;
    j = (i++) + (i++) + (i++);
    alert("The second j is ：" + j);
</script>
</html>